This alert expired on 13 August 2026 at 00:51 UTC. It is kept here as a record.
It is the 2nd strongest of the 31 detections recorded within 20 km of this point since 15 March 2026. Another comparable one was recorded here earlier the same day. 5 more were recorded here in the fortnight before it.
What the source measured
NOAA reported: Severe Thunderstorm Warning issued August 12 at 7:41PM CDT until August 12 at 7:45PM CDT by NWS St Louis MO
An estimated 18,181 people live within 50 km of this point.
Nearby, since 15 March 2026
- June 26, 2026 · score 34 · 17.7 km
- June 1, 2026 · score 39 · 22.9 km
How we know
Confirmed by 2 independent sources, including NOAA.
Our own score for this event is 34 out of 100, at 83 % confidence.
The score is ours, computed from intensity, exposed population and local history — not the source’s.
Event Data
| Type | Severe weather |
| Severity | medium |
| Calamity Score (ours) | 34 / 100 |
| Our confidence | 83% |
| Coordinates | 37.8281, -89.9214 |
| Nearest City | Farmington (44 km) |
| Population Exposed | 18.2K within 50 km |
| Impact Tier | significant |
| Timestamp | 2026-08-13T00:41:00.000Z |
| Source | https://api.weather.gov/alerts/merged_Severe Thunderstorm Warning_noaa_urn:oid:2.49.0.1.840.0.ffc80fd4cbeae0001def66240a0707ee |
Score Breakdown
Technical Details
| Event | Severe Thunderstorm Warning |
| Urgency | Immediate |
| Certainty | Observed |
| AreaDesc | Randolph, IL; Ste. Genevieve, MO; Perry, MO |
| Headline | Severe Thunderstorm Warning issued August 12 at 7:41PM CDT until August 12 at 7:45PM CDT by NWS St Louis MO |
| Expires | 2026-08-12T19:51:00-05:00 |
| SenderName | NWS St Louis MO |
| HasExactCoords | true |
| MergedCount | 2 |
| MergedIds | ["noaa_urn:oid:2.49.0.1.840.0.ffc80fd4cbeae0001def66240a0707ee872fdebb.001.1","noaa_urn:oid:2.49.0.1.840.0.c04894bc087f8fbeff4cd3cfa272916b800a0fd2.001.1"] |
| Iem TypeSummary | G |
| Iem Magnitude | 60 |
| Iem Unit | MPH |
| Iem City | 5 E Farmington |
| Iem County | St. Francois |
| Iem State | MO |
| Iem Wfo | LSX |
| Iem Remark | Winds gusting to 60 mph for 3 minutes. |
| MergedSources | [{"id":"iem_G_37.780_-90.340_1786579020000","source":"iem","severity":"low","severityValue":25,"timestamp":1786579020000,"latitude":37.78,"longitude":-90.34}] |
Safety Information
Always follow official guidance from your local emergency management agency. This platform provides scientific monitoring data and is not a substitute for official warnings. If you are in immediate danger, contact your local emergency number.
Series begins 10 February 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Calamity.live data shows a weather event with CalamityScore 34/100 (United States), based on data from noaa. Source: Calamity.live, a platform aggregating real-time data from 188 scientific monitoring sources.